Shops still have them, US sold out
powercolorlogo

The one with single 6-pin power connector
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Barts goes down to US $150
dell

Goes the way of Fusion
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Might be unlockable as well
sapphire-logo

Looks ready to us

radeon_logo_new

AMD's answer to GTX 550 Ti

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Barts at 975MHz

apple

Found under the bonnet of update 10.6.7
nvidia

It all comes down to price